Casting apparatus



March 4, 1930. 's. H. CARBIS' 1,749,314

' CASTING APRARATUS Filed'Jan. 2'7, 192a 2 Sheets-Sheet 1 i will...

FIG.2

S. H- CARBIS CASTING APPARATUS March}, 1930.

Filed Jan. 27, 1928 2 Sheets-Sheet 2 wring 50 respectively, showing. a diiferent form of nected to each three-hole system. A partial 10o Patented Mar. 4, 1930 I UNITED STATES PATENT OFFICE SAM H. QARIBIS, OF TARENTUM, PENNSYLVANIA CASTING APPARATUS Application filed January 27, 1928. Serial No. 249,807.

This invention relates to the production of suction plate and a surrounding packing duplex ingots or billets in which the outside ring. section of the in at differs in composition The mold comprises a fixed half or section from the inner body or core of the ingot. I 10. a hinged half 12, and a bottom block 14 In one method of producing such ingots the (Figs. 1 and 3). Section 12 is hinged to 55 billet comprises an aluminum alloy body covfixed half by hinge pin 16 passing through ered by layers of corrosion-resistant alumisuitable brackets 011 the two sections. When num or aluminum alloy. the mold is closed the two halves are clamped The inner surface of the mold in which the together by latch bolts 18 hinged by pins 20 o ingot is to be cast is first lined with plates to the fixed section of the mold and passing of the corrosion-resistant coating metal and through slots 22 in the hinged mold sectionthe pouring of the core metal into the mold is The free ends of bolts 18 are threaded and so regulated that as the core metal solidifies are provided with wing nuts 24. A helical it forms a superficial bond with the lining spring 26 is placed between each nut 24 and 16 plates and the plates become aflixed to the the hinged half of the mold. c5 casting. Fixed half 10 is provided at one corner In the practice of forming castings of the with an ear 28 through which passes a round above description certain precautions must rod 30. The ends of rod 30 are supported be observed in holding the lining plate in by pedestals 32 resting on the floor. This 20 the mold during the casting operation, and arrangement permits the entire mold to in allowing proper freedom of movement of swing about pm 30, as may best be seen n the plates during the solidification of the g- 1- molten metal. At the corner of the fixed half of the mold,

The principal object of the pr nt indiagonally opposite pin 30, is another ear 34 g 25 ention is to provide a, new apparatus and to which is attached vertical hOiStll'lg cable method by which the lining lat m b 36, the ut1l1ty of which will herelnafter apheld and controlled in the mold during the p casting of duplex ingots. The inner surface of each half of the mold Further and other objects and advantages 1S PIOVldGd Wl h nlne ports or openings 38 30 will be hereinafter set forth in the accomgs 3 and aITflIl ed 111 hI' I0WS 0f panying specification and claims, and shown t Ports eachof P 15 Shown in the drawings which by way of illustra- 1n g n w l h p r 38 1 a clr tion show what i now o id d t b th lar opening in a clrcular plate 40 set into the preferred mbodi nt of th i ti face of the mold with the inner surface of :5 Fi 1 i id i f th m 1d, t1 i plate 4Q flush with the mold face. From port 86 ti h i i i nd l h i 38 a drilled hole 42 leads to the outer surface method f Supporting the mold. of the mold where 42 is provided with pipe Fig. 2 is a View'of Fig 1 from the left threads 44. To each threaded openmg 44 is Fig. 3 is a section on the line 3-3 of Fig. 1. if q i z gi E 4 is a View, Partly in section, taken in Va Y 1S f em 1e reg-way ype the direction of lines 44 in Fig 1, all piphavmg a rehef g 50 to atmosphere b d b d th and having a stem 52 r connection of an mg 9 eyon muons operating handle, not shown. The nine Fig. 51s a view of a suction plate, on the Valves on each half of the mold are intercon- 45 1me 5 5 9 nected by suitable pipe fittings as best shown g- 6 1s a fragmentary e s in Fig. 1. A suction hose 54 may be conthe l ne 6-6 F gshowmg details 0i nected to each nine-hole system through a suction plate in Fig. 5. valve 56, as shown in Fig. 1, or if greater Figs. 7 and 8 are similar o Fig 5 and 6 suction power is desired a hose may be con- .59 and thus prevent the suction from extending to the edge of the coating plate and mold wall. Packing 59 is of asbestos or other suitable material.

With the above apparatus in mind the method of operation may be readily understood. Coatlng plates 60 are placed in the mold, one plate against each side of the mold. To hold the plates against the inner mold surfaces, valves 56 are opened, thereby connecting both suction pipes 54 to all ports 3 8. So long as a vacuum or partial vacuum is maintained at the ports, so long will lates 60 be held by suction tightly against t e inner mold walls.

With plates 60 held as above descrlbed, the mold is raised by cable 36 until the mold is in a position about as indicated in Fig. Molten metal to form the core of the ingot is then poured gently into the mold through the open end thereof.

To insure a successful casting'it is necessary that the linin plates remain in close contact with the mo d surface until the metal partially solidifies. If the contact with the mold surfaces is not maintained during pouring the heat transferred from the molten metal to the lining plates may not be dissipated rapidly enough through the mold and the lining plates may fuse as a result. Furthermore, if the plates are not rigidly held they may soften and bulge or warp due to the 'heat of the metal and, therefore, allow the metal to flow between the lining plates and the mold surface and permit as well local overheating and fusion of the lining plates. It is further necessary that as the metal solidifies or shrinks away fromthemold surface that the lining plates be free to follow so that the bond already formed between the plates and the first metal to solidify will not be destroyed.

These requirements are fully met by the present apparatus. When the molten metal reaches the level of the pouring edge as indicated by line 62, valves 48 of the lower (right hand) row of ports are turned to close them to the vacuum line 54 and open them to atmosphere through relief openings 50, thereby releasing the suction and permitting the plates to follow the core as it solidifies.

Pouring continues and the mold is gradually lowered by means of cable 36 until the molten metal reaches the approximate position shown by line 64, whereupon. after the metal has sufliciently' solidified the second row of valves is closed to break the suction 'on the middle row of ports. When the mold of the ingot as the metal shrinks, thus pro-' ducing a sound ingot without large or undesirable shrinkage cavities. The successive elimination of the suction force from the openings allows the plates to move inward as the metal solidifies.

This method of holding the lining plates is simple and flexible in contrast with clamps, screwsv or other clumsy mechanical devices. It permits rapid mold operations and eliminates the time-consuming adjustin of clamps and the. like. Further, the plates are so controlled as to eliminate the objectionable bulging or warping due to pressure and heat so that the ingots are cast in a satisfactory state.

It is to be understood that the invention is not limited to the specific apparatus and procedure herein described but may be carried .out in various ways without departure from its spirit, as defined by the appended claims.

I claim- 1. The method which comprises holding coating plates b suction against the inner walls 0 a mol pouring molten metal slowly into said mold, and progressively releasing the suction on said plates as they become covered with molten metal.

2. The method of casting duplex ingo which comprises holding coating plates b suction against the inner walls of a mold: pouring molten metal slowly into said mold, changing the angular position of the mold so that said plates will be gradually covered with molten metal, and rogressively releasing the suction on saidp ates as they become covered.

3. A mold for casting duplex ingots comprising in combination, suction means for holding coating plates against the inner walls of the mold, and means for releasing said suction from selected portions of said plates as desired.

4. Apparatus of the class described comprisinglm combination, a mold, means for pivota y supporting said mold, suction devices for ho in coating plates against the inner walls of said mold, means for changing the angular position of said mold about said pivotal support while molten metal is being of casting duplex. ingots poured into the mold, and means releasing the suction of any of said devices at the will SAM H. CARBIS. 

